title: Effects of intrinsic and extrinsic factors on the diet of Bathyraja macloviana, a benthophagous skate.
abstract: The effects of intrinsic (sex, maturity stage and body size) and extrinsic (depth and region) factors on the diet of Bathyraja macloviana, in the south-west Atlantic Ocean, were evaluated using a multiple-hypothesis modelling approach. Bathyraja macloviana fed mainly on polychaetes followed by amphipods, isopods and decapods. Effects of intrinsic and extrinsic factors on diet composition of this species were found. The consumption of polychaetes had a humped relationship with total length (L(T), and isopods and decapods increased with increasing L(T). Immature individuals preyed on amphipods more heavily than mature individuals. Furthermore, region and depth had an important effect on the consumption of isopods, decapods and amphipods. Such ontogenetic changes and spatial patterns may provide insights into understanding the regulatory mechanisms of marine communities.
authors.affiliation: Laboratorio de Ictiología, Instituto de Investigaciones Marinas y Costeras-IIMyC-CONICET, Universidad Nacional de Mar del Plata-UNMdP, Funes 3350, Mar del Plata B7602AYL, Argentina. sbarbini@mdp.edu.ar
authors.forename: S A
authors.initials: SA
authors.lastname: Barbini
authors.forename: L B
authors.initials: LB
authors.lastname: Scenna
authors.forename: D E
authors.initials: DE
authors.lastname: Figueroa
authors.forename: J M
authors.initials: JM
authors.lastname: Díaz de Astarloa
mesh_terms: D000367:Age Factors; D000818:Animals; D001267:Atlantic Ocean; D049628:Body Size; D004032:Diet; D005247:Feeding Behavior / Q000502:physiology; D005260:Female; D008297:Male; D012737:Sex Factors; D012860:Skates, Fish
keywords: Rajidae; feeding habits; ontogenetic shifts; south-west Atlantic; spatial variation